import numpy as np

# 创建一个连续数组，范围在[10, 21)之间，间隔为2
arr = np.arange(10, 21, 2)

# 将数组改变为一个2行3列的矩阵
matrix = arr.reshape(2, 3)

# 输出矩阵
print("矩阵：")
print(matrix)
